Snooze failing in Apple Mail

I am getting the following error when snoozing a mail in Apple Mail. I’m not sure when it started as I don’t use the Snooze function very often:Snoozing in the cloud failed with your account <ECEmailAddress: 0x600003b12d20> 7226, <ECEmailAddress: 0x600003b12940> a7beYou may switch to local snoozing by going to Mail’s Preferences -> Mailbutler -> Compatibility Settings… and checking the box next to your account.Server error:A backend error occurred. — Please try again later. (invalid_contact_meta)
Send Later is also not working (this was working earlier this week):Send Later in the cloud failed with your account <ECEmailAddress: 0x600003b12d20> 7226, <ECEmailAddress: 0x600003b12940> a7beYou may schedule your message in compatibility mode which requires you to keep Mail open.Server error: A backend error occurred. — Please try again later. (invalid_contact_meta)